Question: When did Hannes Alfvén cease to be a member of the Royal Swedish Academy of Engineering Sciences?
Paraphrase: Hannes Alfvén ceases to be a member of the Royal Swedish Academy of Engineering Sciences when?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q54945 p:P463 ?s . ?s ps:P463 wd:Q3394637 . ?s pq:P582 ?value}